What Is The HGV Medical?
The D4 form is used to evaluate a driver’s physical and mental health to determine if they are fit enough to drive a large vehicle safely. This medical examination is a mandatory requirement, completed by a doctor, to assess a driver’s fitness to drive large vehicles, ensuring they meet the requirements set by the DVLA (Driver and Vehicle Licensing Agency).
All commercial drivers need an HGV medical assessment before they can get on the road, then after that it may need renewing; D4 medical assessments are required to be renewed every five years for drivers over the age of 45 but under the age of 65, and every year for drivers over the age of 65.
Can You Fail The HGV Medical?
Can you fail your D4 HGV medical assessment? The short answer: Yes. The assessment is designed to ensure you are physically and mentally fit to drive a large vehicle safely. If a doctor finds that you don't meet the standards set by the DVLA, you can fail the medical assessment.
What Happens If You Fail?
- The doctor will note the issue on your D4 medical form.
- This form is sent to the DVLA, who will assess your fitness to drive.
- In some cases, you may be asked to undergo further tests or provide additional medical information.
- If you're deemed unfit to drive, you won't be granted (or may lose) your HGV licence.
- You can reapply if your health improves or after completing any required treatment.
Failing doesn’t always mean the end, often issues can be resolved with medical support or proper documentation.
Common Reasons For Failing
- Poor eyesight or untreated vision problems
- Heart conditions or high blood pressure
- Neurological disorders (e.g., epilepsy)
- Alcohol or drug misuse
- Mental health concerns
- Diabetes not managed properly
- Sleep apnea
How To Prepare And Pass
One of the best ways to avoid surprises on the day of your medical, is to get a general health check-up with your GP before attending your official D4 HGV medical. This gives you a chance to address any potential issues, like high blood pressure or vision concerns, before they’re flagged during your assessment. If you wear prescription glasses or contact lenses, make sure to bring them to your appointment, as your eyesight will be tested to ensure it meets DVLA standards for commercial driving. Most importantly, be honest with the doctor conducting the medical. If you have an existing condition, don’t try to hide it. In many cases, having a medical issue doesn’t mean automatic failure, as long as it's well-managed and documented. Getting the right treatment or specialist support early can make all the difference in passing and getting on the road confidently.
What If You Fail?
Failing your HGV medical isn’t always the end of the road. In many cases, you’ll have the option to retake the medical after addressing the issue, especially if it’s something treatable like high blood pressure or vision problems. The DVLA may also refer you to a specialist for further assessment if they need more detailed information about a specific condition. During this time, they’ll review all medical reports and test results before making a final decision about your fitness to drive. If your health improves or you meet the necessary standards after treatment, you can reapply for your licence and get back on track.